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← ScienceWhich mechanism initiates chain scission reactions in polymer molecules immersed in ultrasonic fields?
A)Sonochemical homolysis by cavitation implosion✓
B)Thermal depolymerization from frictional heating
C)Hydrolytic degradation due to resonant oscillations
D)Mechanical fatigue caused by cyclic loading
💡 Explanation
When polymers are exposed to intense ultrasound, acoustic cavitation generates collapsing microbubbles, resulting in extremely high local temperatures and pressures initiating free-radical formation, accelerating the rate of homolysis causing bonds to break. Therefore, sonochemical homolysis results, rather than alternatives all resulting from completely separate mechanisms.
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